How to fix the lenses of a homemade straight telescope

I said, don't you want your own eyes, as long as the telescope is not standardized, the impact on the eyesight is great, not to mention the astronomical telescope, I advise you to buy a regular one, you can go to Wuhan Rongcheng Technology that telescope ** to see, how to say that it is still the most important thing in your body, not to mention whether there are materials, and the materials are not standardized, it is very difficult to make alone, it is a fine job, otherwise why would the telescope sell so expensive.

Telescope lenses are not easy to buy around, you can find a reading glasses with a large focal ratio (generally about 100 degrees, focal length of 1 meter, you can see the crater of the moon) crop lenses, if you want a better effect, you can also go to the Internet to find telescope lenses; The eyepiece is made of a convex lens with a short focal length (magnification = objective focal length eyepiece focal length). If you do it well, the effect will not be bad; You can check the relevant knowledge, you can go to the "Shepherd Astronomy Forum" to have a look.

Hello, in fact, this question has been given back to others before. Let's not talk about whether there are any for sale.

The key is that if you simply buy parts, how can you know what kind of accuracy you are buying? What should I do if I buy a defective product?

I am in this industry, the current market, very chaotic, a very large proportion of products on the market, there are some low-grade parts in the product, but they at least have constraints, because if there is more moisture, the effect is poor.

But when you buy parts, you don't know the effect until you've made them – and if you're a beginner, you're afraid you won't be able to see it. Because there is no contrast.

On the other hand, you can imagine how expensive it is to buy a bicycle. Or buy some bike parts and assemble them yourself? Obviously it's expensive to buy parts!!

One is because manufacturers have special channels to obtain cheap and high-quality parts. The other one, which is related to commercial profits, will not be discussed.

If you're really in a hurry, check out this one for me.

There is an outlet desktop type inside, with a diameter of 60 mm, and the focal length may be about 500 mm. This is a finished product, the accuracy of the parts inside is good, and it is a product exported to Germany and North America.

It is advisable not to buy second-hand things.

Know the knowledge before you spend the money.

The lens of a refractive astronomical telescope is a lens group composed of convex and concave lenses, and it is extremely difficult to grind it yourself under amateur conditions due to strict control of the glass material, surface shape and accuracy of each face.

The primary mirror of a reflective astronomical telescope is a concave mirror that can be ground by itself (only one side needs to be ground into a good reflective surface). If you want to buy this glass, you can search the Internet for the keyword "mirror blank". Generally, two pieces are purchased at the same time, one for the mirror blank and the other for the grinding tool plate.

It's a lot of trouble, you have to buy glass, buy abrasives, buy sand and fillers, grind lenses, calculate focal length, glue lenses, and spend a lot of money.

It's better to buy a pair of tubes when you're just getting started.

It is difficult to grind a mirror, and a set of objective lenses has 4 spheres, which is enough for beginners to grind for a few months. It is recommended that you buy lenses and assemble them yourself, as it will also have a lot of fun.

There is a smart telescope store on Alibaba.

Chengxintong) specializes in intelligent (can automatically find stars and track) astronomical telescopes, and also sells "astronomical telescope lenses for middle school students' experiments".

Hello, I am a military optical manufacturer distributor.

It should be possible to make it, and your description of the lenses is very detailed, very good!

Start with the eyepiece – and gradually move on to the objective.

First of all, there are three lenses in total.

The objective lens is one piece, and the eyepiece is an eyepiece group! There are two pieces.

-Don't have too many lenses. Affects clarity. Note that the ones used are all monoconvex, and try not to use biconvex.

Eyepiece set: The upper lens, facing the eye side, is flat. Then the lower lens, opposite to the orientation of this lens – it is on the flat side, facing the objective lens below.

The distance between these two lenses can be 2 cm. If the convexity of these two lenses has a size, the convexity is relatively small, as the one close to the eye.

Objective: About 10 cm away from this eyepiece group, the lens is facing the flat side downward. Towards the observation target.

Then find a tube and fix these lenses into it, this is very critical, otherwise the ** effect will be greatly reduced.

And one last point, find a black plastic sheet and drill a hole with a diameter of 2 mm in the middle. The distance from the objective lens can be 2 mm. This is called a grating.

As long as you follow these strictly, the microscope will come out very well.

A microscope consists of a convex and concave lens and a lens barrel, so you can't do it. Ha ha.

If you are making 8-inch or 10-inch lenses, you can buy the primary mirror and secondary mirror group directly online.

To be honest, it's more difficult to grind by yourself, a 1-meter primary mirror is estimated to be grinding for several months, and when the grinding is over, we will become sports stars, at least the waist will be very powerful haha.

The first floor is also a convenient way to pre-cast the general shape and then grind. But did you know how many months it takes to anneal after we cast the binder?

The thickness of the one-meter aperture primary mirror should be at least 20cm, haha How heavy? Isn't it better to be hundreds of kilograms.

How big are you? How much more caliber? 1000？

Actually, I also want to know, I want to make a 1-meter diameter cow anti, that's how to get this lens.

Can you pour it first and then polish it, it will be much better, don't take a blank to polish, it will die.

Here the rolling fiber is taken as an example of 200mm, which is very detailed. You can change the lens diameter and focal length according to the arrogance at hand, and you can get the data you need.

Note that DIY requires care, patience, and especially persistence.

Talent. can tell you. It's up to the individual to make it. It's not easy.

The lens barrel is enough for you.

The magnification is 800 30, and the objective aperture is also sufficient, and the crater should be seen.

If you don't see it, it's probably not in focus.

That's probably because the lenses are bad.

Aging lenses can be made with homemade astronomical telescopes. According to the formula: magnification.

Objective focal length The eyepiece rubber grips the focal length, if you use a limb such as a 100mm reading lens for the objective, choose an eyepiece with a focal length of 5mm, and the magnification is 20x. You can see the crater of the moon and the Galilean moons of Jupiter. DIY check it out.